Fox Co. maintains an investment portfolio.If Fox buys Owl Co. common stock, which method and treatment should Fox never use for this investment on the balance sheet or income statement:

Group of answer choices

Fair value method, with holding gains and losses included as part of net income

Cost method if fair value can never be determined until sold when gain or loss is included in net income

Amortized cost method, with only realized gains and losses included in net income

Equity method, with investment value adjusted by investor's share of investee's net income